Welcome to RS
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I should have it drilled for it (for future use) or not.
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If it's an acrylic tank then I would say go for it because it'll eliminate the use of unsightly Powerheads but if it's glass then it's a little tricky and should be done by professionals unless you have experience drilling glass.
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Is it necessary that the sump be drilled? Currently it is not
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It's not necessary you could use a submersible pump like a Mag drive pump which I also use, but these can transfer heat to the tank, external would be better but it's not a big deal.
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Should I try to transfer as much of the water from my current 130 in the 180?
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Yes I would since your livestock is already acclimated to those water conditions.
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I have my 1" of aragonite in my 130. It doesn't look as natural, but I am more concerned with trying to minimize any nitrite (or is it nitrate) build up. What do you think?
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If you like to have substrate then a Deep Sand Bed about 4-6" in height would be the way to go and has the added benefit of being able to denitrify converting nitrates to free nitrogen but it has to be setup properly to work effectively.